Simultaneous determination of nine atmospheric amines and six inorganic ions by non-suppressed ion chromatography using acetonitrile and 18-crown-6 as eluent additive.
Simultaneous determination of nine atmospheric amines and six inorganic ions by non-suppressed ion chromatography using acetonitrile and 18-crown-6 as eluent additive.
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DOI：
10.1016/j.chroma.2020.461234
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发表时间：
2020-08
期刊：
影响因子：
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通讯作者：
Hao Feng;X. Ye;Yuxuan Liu;Zikai Wang;Tianxiang Gao;Anyuan Cheng;Xiaofei Wang;Jianmin Chen
中科院分区：
文献类型：
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作者：
Hao Feng;X. Ye;Yuxuan Liu;Zikai Wang;Tianxiang Gao;Anyuan Cheng;Xiaofei Wang;Jianmin Chen
大气中的胺有助于新粒子的成核和初始生长以及二次有机气溶胶的形成，影响地球大气的辐射平衡。在这项研究中，我们开发了一种离子色谱（IC）方法，用于分离和定量的9个最丰富的胺（甲基铵（MMAH+），二甲基铵（DMAH+），三甲基铵（TMAH+），乙基铵（MEAH+），二乙基铵（DEAH+），丙基铵（MPAH+），丁基铵（MBAH+），乙醇胺（MeOH+），和三乙醇胺（TEOH+））从大气气溶胶中的六种常见的无机物种。通过向洗脱液中加入乙腈来改变胺的保留时间，因为乙腈可以减少疏水胺在固定相上的吸附。所开发的方法实现了DEAH+和TMAH+与无机阳离子的成功分离，在已建立的IC方法中，这些无机阳离子经常彼此共存。用18-冠-6络合K+，延长了K+的保留时间，消除了K+对MEAH+测定的干扰。最后，对9种目标胺和6种常见无机阳离子进行了分离，对DEAH+和MPAH+的分离度Rs ≥ 1.2，对其它种类的分离度Rs > 1.5。9种胺的检出限为0.34-1.48 ng，无机阳离子的检出限为0.19-0.56 ng。该方法已成功地应用于测定低分子量胺和无机阳离子的PM2. 5收集在上海市区网站和崇明岛的隔离海岸。在城市样品中检测到8种胺，以MMAH+和DMAH+为主。城市气溶胶中的平均胺浓度为76.3 ± 38.4 ng m−3，比从海岸采集的海洋样品高出约4倍。
Atmospheric amines contribute to the nucleation and initial growth of new particles as well as secondary organic aerosol formation, influencing the radiative balance of the Earth's atmosphere. In this study, we develop an ion chromatography (IC) method for separating and quantifying the nine most abundant amines (methylaminium (MMAH+), dimethylaminium (DMAH+), trimethylaminium (TMAH+), ethylaminium (MEAH+), diethylaminium (DEAH+), propylaminium (MPAH+), butylaminium (MBAH+), ethanolaminium (MEOH+), and triethanolaminium (TEOH+)) from six common inorganic species in atmospheric aerosols. The retention times of the amines were altered by the addition of acetonitrile to the eluent because acetonitrile can reduce the adsorption of hydrophobic amines on the stationary phase. The developed method achieved the successful separation of DEAH+and TMAH+from inorganic cations, which often coelute with each other in established IC methods. The interference of K+on the determination of MEAH+was eliminated by the complexation of K+with 18-crown-6, which prolonged the retention time of K+. Finally, 9 target amines and 6 common inorganic cations were separated, with a resolution Rs ≥ 1.2 for DEAH+and MPAH+and Rs > 1.5 for other species. The detection limits varied in the range of 0.34-1.48 ng for the 9 amines and 0.19-0.56 ng for the inorganic cations. The developed method was successfully applied for the determination of low molecular weight amines and inorganic cations in PM2.5collected from an urban site in Shanghai and an isolated coast of Chongming Island. Eight amines were detected in the urban samples, in which MMAH+and DMAH+dominated. The average amine concentration in the urban aerosols was 76.3 ± 38.4 ng m−3, which is approximately 4-fold higher than those in the marine samples collected from the coast.